EVP_PKEY_new, EVP_PKEY_up_ref, EVP_PKEY_free - private key allocation functions
#include <openssl/evp.h> EVP_PKEY *EVP_PKEY_new(void); int EVP_PKEY_up_ref(EVP_PKEY *key); void EVP_PKEY_free(EVP_PKEY *key);
The EVP_PKEY_new() function allocates an empty EVP_PKEY structure which is used by OpenSSL to store private keys. The reference count is set to 1.
EVP_PKEY_up_ref() increments the reference count of key.
EVP_PKEY_free() decrements the reference count of key and, if the reference count is zero, frees it up. If key is NULL, nothing is done.
The EVP_PKEY structure is used by various OpenSSL functions which require a general private key without reference to any particular algorithm.
The structure returned by EVP_PKEY_new() is empty. To add a private key to this empty structure the functions described in EVP_PKEY_set1_RSA should be used.
EVP_PKEY_new() returns either the newly allocated EVP_PKEY structure or NULL if an error occurred.
EVP_PKEY_up_ref() returns 1 for success and 0 for failure.
EVP_PKEY_new() and EVP_PKEY_free() exist in all versions of OpenSSL.
EVP_PKEY_up_ref() was first added to OpenSSL 1.1.0.
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